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  1. SOfirst time event for old potter. I packed kiln with mugs and bowls. Yes a different glaze but also same clay same ish design old tried and true glaze on half the mugs. some mugs had additions of clay molded pieces attached also. Kiln and scheduled for usual ramping. c 6 firing finishing at 8.30 a.m. one top bung left out. 2 a.m. , I am an old potter used to manually turning up every hour, kiln temp. 480deg. Power out sometime between then and 6.30a.m...no alarm to awaken the sleeping potter..temp 350degC..reprogrammed kiln to go up to 1100 at150C/hr and then usual schedule of 80dc/hr to end and a 15 hold. top bung in. Folk have said it's ok to go this fast , right? I never have before. Result I have12 whole mugs out of 40. rest have a BEAUTIFULLY horizontal crack in middle of handle starting from underside of handle , not quite through the handle so it looks whole from above.Crack is sharp. Second cooling v. slow, finished firing sunday arvo, opened last night. Occurring in both designs and both glazes Bowls crack straight across bottom. ah it's never boring!
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